nginx the "ssl" directive is deprecated, use the "listen ... ssl"

After NGINX upgrade to `v1.15.2` starts getting the warning. `nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /usr/local/etc/nginx/sites-enabled/confid-file-name:8` Where the 8th line is `ssl on;` how I can solve this?